| 词条 | Molybdenum diselenide |
| 释义 |
| ImageFile = Molybdenite-3D-balls.png | ImageSize= 230px | ImageFile2 = MoSe2 STEM.jpg | ImageSize2=240px | ImageCaption2=Top-view atomic images of MoSe2 before and after (right) ion irradiation[1] | ImageName = Molybdenum diselenide | ImageFile1 = | ImageName1 = | IUPACName = bis(selanylidene)molybdenum | OtherNames = molybdenum diselenide, molybdenumdiselenide, molybdenum selenide, diselanylidenemolybdenum |Section1={{Chembox Identifiers | CASNo = 12058-18-3 | PubChem = 82894 | SMILES = [Se]=[Mo]=[Se]}} |Section2={{Chembox Properties | Formula = {{chem|MoSe|2}} | MolarMass = 253.86 g/mol[2] | Appearance = crystalline solid | Density = 6.90 g/cm3[2] | MeltingPt = >1200 °C[2] | BoilingPt = | Solubility = | BandGap = ~0.85 eV (indirect, bulk) ~1.5 eV (direct, monolayer)[3][4] }} |Section3={{Chembox Structure | CrystalStruct = hP6, space group {{chem|P6|3}}/mmc, No 194[5] | LattConst_a = 0.3283 nm | LattConst_c = 1.2918 nm | Coordination = Trigonal prismatic (MoIV) Pyramidal (Se2−) |Section7={{Chembox Hazards | MainHazards = | FlashPt = | AutoignitionPt = }} |Section8={{Chembox Related | OtherAnions = Molybdenum dioxide Molybdenum disulfide Molybdenum ditelluride | OtherCations = Tungsten diselenide }}Molybdenum diselenide ({{chem|MoSe|2}}) is an inorganic compound of molybdenum and selenium. Its structure is similar to that of {{chem|MoS|2}}.[6] Compounds of this category are known as transition metal dichalcogenides, abbreviated TMDCs. These compounds, as the name suggests, are made up of a transition metals and elements of group 16 on the periodic table of the elements. Compared to {{chem|MoS|2}}, {{chem|MoSe|2}} exhibits higher electrical conductivity.[7] StructureLike many TMDCs, {{chem|MoSe|2}} is a layered material with strong in-plane bonding and weak out-of-plane interactions. These interactions lead to exfoliation into two-dimensional layers of single unit cell thickness.[8] The most common form of these TMDCs have trilayers of molybdenum sandwiched between selenium ions causing a trigonal prismatic metal bonding coordination, but it is octahedral when the compound is exfoliated. The metal ion in these compounds is surrounded by six {{chem|Se|2-}} ions. The coordination geometry of the Mo is sometimes found as octahedral and trigonal prismatic.[9] SynthesisSynthesis of {{chem|MoSe|2}} involves direct reaction of molybdenum and selenium in a sealed tube at high temperature. Chemical vapor transport with a halogen (usually bromine or iodine) is used to purify the compound at very low pressure (less than 10-6 torr) and very high temperature (600–700 °C). It has to be heated very gradually to prevent explosion due to its strong exothermic reaction. Stoichiometric layers crystallize in a hexagonal structure as the sample cools.[9] Excess selenium can be removed by sublimation under vacuum.[10] The synthesis reaction of {{chem|MoSe|2}} is: Mo + 2 Se → {{chem|MoSe|2}} === 2D-{{chem|MoSe|2}} === Single-crystal-thick layers of {{chem|MoSe|2}} are produced by scotch tape exfoliation from bulk crystals or by chemical vapor deposition (CVD).[11][12]The electron mobility of 2D-{{chem|MoSe|2}} is significantly higher than that of 2D-{{chem|MoS|2}}. 2D {{chem|MoSe|2}} adopts structures reminiscent of graphene, although the latter's electron mobility is thousands of times greater still. In contrast to graphene, 2D-{{chem|MoSe|2}} has a direct band gap, suggesting applications in transistors and photodetectors.[11] Natural occurrenceMolybdenum(IV) selenide occurs in the nature as the extremely rare mineral drysdallite.[13] References{{Commons category|Molybdenum diselenide}}1. ^{{cite journal|doi=10.1038/srep30481|pmid=27480346|pmc=4969618|title=Nanoforging Single Layer MoSe2 Through Defect Engineering with Focused Helium Ion Beams|journal=Scientific Reports|volume=6|pages=30481|year=2016|last1=Iberi|first1=Vighter|last2=Liang|first2=Liangbo|last3=Ievlev|first3=Anton V.|last4=Stanford|first4=Michael G.|last5=Lin|first5=Ming-Wei|last6=Li|first6=Xufan|last7=Mahjouri-Samani|first7=Masoud|last8=Jesse|first8=Stephen|last9=Sumpter|first9=Bobby G.|last10=Kalinin|first10=Sergei V.|last11=Joy|first11=David C.|last12=Xiao|first12=Kai|last13=Belianinov|first13=Alex|last14=Ovchinnikova|first14=Olga S.|bibcode=2016NatSR...630481I}} {{Molybdenum compounds}}{{Selenides}}2. ^1 2 {{RubberBible92nd|page=4.76}} 3. ^{{cite journal|doi=10.1103/PhysRevB.85.033305|title=Thickness and strain effects on electronic structures of transition metal dichalcogenides: 2H-MX2 semiconductors (M = Mo, W; X = S, Se, Te)|journal=Physical Review B|volume=85|issue=3|pages=033305|year=2012|last1=Yun|first1=Won Seok|last2=Han|first2=S. W.|last3=Hong|first3=Soon Cheol|last4=Kim|first4=In Gee|last5=Lee|first5=J. D.|bibcode=2012PhRvB..85c3305Y}} 4. ^{{cite journal|doi=10.1038/srep25041|pmid=27112195|pmc=4844971|title=Optical polarization and intervalley scattering in single layers of MoS2 and MoSe2|journal=Scientific Reports|volume=6|pages=25041|year=2016|last1=Kioseoglou|first1=G.|last2=Hanbicki|first2=A. T.|last3=Currie|first3=M.|last4=Friedman|first4=A. L.|last5=Jonker|first5=B. T.|bibcode=2016NatSR...625041K|arxiv=1602.00640}} 5. ^{{Cite journal | doi = 10.1007/BF01671439| title = Growth conditions and structural characterization of MoSexTe2−x (0 ⩽ x ⩽ 2) single crystals| journal = Journal of Materials Science Letters| volume = 5| pages = 66–68| year = 1986| last1 = Agarwal| first1 = M. K.| last2 = Patel| first2 = P. D.| last3 = Joshi| first3 = R. M.}} 6. ^{{cite book|author1=Greenwood, N. N. |pages=1017–1018|author2=Earnshaw, A. |title=Chemistry of the Elements|url={{google books|plainurl=yes|id=EvTI-ouH3SsC}}|date=11 November 1997|publisher=Elsevier|isbn=978-0-08-050109-3}} 7. ^{{Cite journal | doi = 10.1016/j.apmt.2017.01.006| title = Molybdenum Diselenide ({{chem|MoSe|2}}) for Energy Storage, Catalysis, and Optoelectronics| journal = Applied Materials Today| volume = 8| pages = 1–16| year = 2017| last1 = Eftekhari| first1 = Ali}} 8. ^{{cite journal|doi=10.1038/nnano.2012.193|pmid=23132225|title=Electronics and optoelectronics of two-dimensional transition metal dichalcogenides|journal=Nature Nanotechnology|volume=7|issue=11|pages=699–712|year=2012|last1=Wang|first1=Qing Hua|last2=Kalantar-Zadeh|first2=Kourosh|last3=Kis|first3=Andras|last4=Coleman|first4=Jonathan N.|last5=Strano|first5=Michael S.|bibcode=2012NatNa...7..699W|url=http://infoscience.epfl.ch/record/182177}} 9. ^1 Parilla, P.; Dillon, A.; Parkinson, B.; Jones, K.; Alleman, J.; Riker, G.; Ginley, D.; Heben, M; Formation of Nanooctahedra in Molybdenum Disulfide and Molybdenum Diselenide Using Pulsed Vapor Transport {{doi|10.1021/jp036202}} 10. ^Al-hilli, A.; Evans, L. The Preparation and Properties of Transition Metal Dichalcogenide Single Crystals. Journal of Crystal Growth. 1972. 15, 93–101. {{doi|10.1016/0022-0248(72)90129-7}} 11. ^1 {{cite web|url=http://www.rdmag.com/news/2014/04/scalable-cvd-process-making-2-d-molybdenum-diselenide |title=Scalable CVD process for making 2-D molybdenum diselenide |publisher=Rdmag.com |date=2014-04-04 |accessdate=2014-04-09}} 12. ^{{Cite journal | doi = 10.1021/nn405717p| pmid = 24712299| pmc = 4046802| title = Next-Generation in Situ Hybridization Chain Reaction: Higher Gain, Lower Cost, Greater Durability| journal = ACS Nano| volume = 8| issue = 5| pages = 4284–94| year = 2014| last1 = Choi | first1 = H. M. T. | last2 = Beck | first2 = V. A. | last3 = Pierce | first3 = N. A. }} 13. ^http://www.mindat.org 4 : Selenides|Molybdenum(IV) compounds|Transition metal dichalcogenides|Monolayers |
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